u can use any new bats i would reccomend 3300 or better as for a charger a good cheap one is the vision peak
http://www.dynamiterc.com/Products/D...ProdID=DYN4045
im not quite shure what rims wil fit the jrx so u might have to ask around a bit or check ebay for rims
the only way u would be ablre to shorten ur antenna would be to buy a diffrent reciver that had a shorter wire
as for a body i just checked and didnt find any stock ones on ebay u migth just have to try diffrent bodys to looks like the associated rc10 viper body might fit